Well I fixed that compile bug now. Obvious now but at 3 in the morning beyond my capabilities.

I've updated the download (http://will.thimbleby.net/downloads/WaterWindow.zip) and I've changed the colour of the water to a putrid green so that it shows up better against the desktop. It's faster and you can now alter the parameters of the smoothed particle hydrodynamics simulation as well.

I dig WaterWindow. I guess it's sort of a sim-game, eh? My favorite thing to do with it is create a pit using three windows and let it fill up like a pool. Then you can spring a leak or push the bottom up an watch it spill over. Nice.